<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>登录</title>
</head>
<body>
    <form>
        <input type="text" placeholder="请输入用户名" name="username">
        <input type="password" placeholder="请输入密码" name="password" value="?">
    </form>
</body>
</html>